ad viewability

Ad viewability refers to whether an online advertisement is actually seen by a user. It measures if an ad is displayed on a screen long enough for someone to potentially notice it. Typically, a standard measure is that at least 50% of the ad must be visible for at least one second. Viewability is important for advertisers because it affects the effectiveness of their campaigns; if ads aren't seen, they can't influence consumers. High viewability rates indicate that the advertising space is valuable and more likely to attract meaningful engagement.